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INCOME TAXES (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 13, 2017
Income Tax Provision [Line Items] |  |  |  |
Domestic | $ 5,169 | $ (39,898) | $ (36,339) |
Foreign | (5,594) | (2,573) | (1,505) |
Total loss before income taxes | (425) | (42,471) | (37,844) |
Federal | (96) | 0 | 11 |
State | 142 | 140 | 94 |
Total income tax expense | $ 46 | $ 140 | $ 105 |
Reconciliation of income taxes at U.S. Federal statutory rate to the provision for income taxes |  |  |  |
U.S. federal statutory rate | 21.00% | 35.00% | 35.00% |
State taxes | (24.84%) | 2.26% | 2.20% |
Foreign taxes | (92.04%) | (1.28%) | (0.81%) |
Change in valuation allowance | 369.27% | 4.58% | (43.96%) |
Stock-based compensation | (874.29%) | (1.21%) | (0.54%) |
Tax credits | 700.35% | 4.96% | 8.77% |
Interest expense | 218.47% | 2.90% | 5.75% |
Effect of rate changes | 13.44% | (130.88%) | (4.65%) |
Convertible senior notes refinancing | 0.00% | 6.55% | 0.00% |
Effect of the adoption of ASU 2016-09 | 0.00% | 68.89% | 0.00% |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | (132.96%) | 0.00% | 0.00% |
Effective Income Tax Rate Reconciliation, Tax Reserves, Percent | (202.98%) | 0.00% | 0.00% |
Other | (6.15%) | 7.90% | (2.04%) |
Effective tax rate | (10.73%) | (0.33%) | (0.28%) |
Deferred tax assets: |  |  |  |
Net operating loss carry-forwards | $ 79,446 | $ 95,067 |  |
Federal and state credits | 17,730 | 15,048 |  |
Depreciation and amortization | 2,851 | 2,593 |  |
Accruals and reserves | 11,009 | 2,743 |  |
Deferred revenue | 0 | 1,841 |  |
Stock based compensation | 18,302 | 16,925 |  |
Inventory | 848 | 552 |  |
Other | 127 | 139 |  |
Total deferred tax assets | 130,313 | 134,908 |  |
Discount on convertible senior notes | (11,655) | (14,678) |  |
Net deferred tax assets, before valuation allowance | 118,658 | 120,230 |  |
Less: valuation allowance | (118,658) | (120,230) |  |
Net deferred tax assets | 0 | 0 |  |
Non-US Net Operating Loss | $ 11,400 |  |  |
Minimum Cumulative Percentage of Change in Ownership as Condition to Offset Taxable Income or Tax | 50.00% |  |  |
Increase in valuation allowance for deferred tax assets | $ 1,600 | $ (28,500) | $ 800 |
Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit) | $ 55,700 |  |  |
United States Statutory Tax Rate | 21.00% | 35.00% | 35.00% |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |
Unrecognized Tax Benefits | $ 2,473 |  |  |
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 408 |  |  |
Unrecognized Tax Benefits | 2,881 | $ 2,473 |  |
Convertible Senior Notes Due 2022 [Member] |  |  |  |
Deferred tax assets: |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  | $ 70,900
Federal |  |  |  |
Deferred tax assets: |  |  |  |
Net operating losses | 346,200 |  |  |
Net Operating Loss, Subject to Limitation | 191,100 |  |  |
Available Net Operating Loss, Subject to Limitation | 108,000 |  |  |
Future NOL's Which Will Become Available (2019-2022) | 10,300 |  |  |
Future NOL's Which Will Become Available (2023) | 3,500 |  |  |
Future NOL's Which Will Become Available (2024-2025) | 1,400 |  |  |
Future NOL's Expired and Unused | 35,800 |  |  |
State |  |  |  |
Deferred tax assets: |  |  |  |
Net operating losses | 159,200 |  |  |
Research Tax Credit Carryforward [Member] | Federal |  |  |  |
Deferred tax assets: |  |  |  |
Tax Credit Carryforward, Amount | 12,700 |  |  |
Research Tax Credit Carryforward [Member] | State |  |  |  |
Deferred tax assets: |  |  |  |
Tax Credit Carryforward, Amount | $ 6,300 |  |  |

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